I had 6 cycles of Chemo August to December last year along with Phesgo after a diagnosis of Stage 4 breast cancer metastasised to my spine. The Phesgo has continued and since September this year I have been struggling with an extremely painful ( and I don't use that term lightly) big toe on my right foot and I have peripheral neuropathy in my feet and hands generally. I am prescribed slow release 40mg of Morphine twice a day and 900g of Gabapentin 3 times a day for pain along with other meds and supplementary ormorph and paracetamol but it doesn't help my toe and the pain is so bad I can't walk easily and can only suffer one pair of loose fitting shoes or toeless sandals if I go out. I have seen my GP, the podiatrist and a private podiatrist, thinking it was an ingrown toenail after the nails had all fallen off and started growing back again after Chemo. 

This week my GP agreed on a blood test for Uric acid to rule out Gout.

I have tolerated the pain of fractured ribs and several fractures in my pelvis in the last year, so I can cope with pain but this is bad and it has gone on so long.

The tip of my toe is particularly sensitive so I can hardly bear my sock or the duvet at night touching it. Any pressure however slight makes me feel faint.

I'm so distraught. I am beginning to give up. No one seems to be able to offer me any explanation, let alone a solution. 

Is it caused by chemo or Phesgo? Is there a test an/or any treatment that can help? Would I need to stop treatment? I'm concerned it could be cancer in my toe?

Please help.